Mayweather (43-0, 26 KO) will be defending his WBC 147-pound title on Showtime Pay Per View against Guerrero (31-1-1, 18 KOs). But despite being the challenger and underdog, it’s Guerrero who has spoken of how he wants to “humble” Mayweather in front of God and explained how age may be finally catching up to the sport’s unanimous pound for pound king.

Golden Boy and Mayweather Promotions rounded out the televised undercard for the Floyd Mayweather Jr.-Robert Guerrero Showtime PPV card on May 4 at the MGM Grand in Las Vegas, formally announcing Tuesday the addition of two fights: junior featherweight Leo Santa Cruz against Alexander Munoz, and middleweight J’Leon Love against Gabriel Rosado.

The world’s No 1 pound-for-pound boxer wrote letters to friends, family and members of his promotional team telling them of his gratitude.

He bought his grandmother a house. When he came out early after having served two months inside, he re-engaged his father, Floyd Snr, as his trainer having had very public, and bitter, disagreements with him in the past.

Mayweather, still unbeaten after 43 fights and a six-time world champion in four weight classes, faces Robert Guerrero (31-1-1, 18 KOs) in a defence of the World Boxing Council welterweight title in Las Vegas next weekend.

“Floyd should have taken the fight with me last year,” explained Guerrero, who defeated former welterweight titlist Andre Berto in his last outing to earn the biggest fight of his career.

Having come up two weight classes and also defeating Turkish bruiser Selcuk Aydin, Guerrero was adamant that welterweight was the right place for him and his best chance at defeating Mayweather. Despite residing most of his career as a featherweight, Guerrero said: “I was ready then and I’m ready now. Except now I had two fights to break into in welterweight, so he [Mayweather] should’ve taken the fight last year.” He said many people think Mayweather is “like a God.”

Floyd Mayweather has pressed through 17 years as an undefeated professional boxing sensation, and apart from Robert Guerrero’s earnestness and punch output, there wouldn’t be anything in the challenger’s pedigree to suggest their fight next Saturday in Las Vegas should end with anything but the predictable result.

That’s also what Muhammad Ali thought against the upstart Leon Spinks and, a decade later, what Larry Holmes thought against the beefed-up light heavyweight Michael Spinks.